You will find more help in the S70 section. The problem is, the compressor clutch gap. It needs to be "re-shimmed". I have this problem in my V70, fortunately, it's winter here now. But when it would happen, it would be mostly at idle, or at a light. Then come on again on the highway. I had refilled with refrigerant, which at least made the compressor work. But I added a little more, and the problem became less frequent. Try that. Also, if you want to fix the compressor, here is a guide from Volvo Forums. http://volvoforums.com/forum/showthread.php?t=6665
Good luck.
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Jake
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